Spring-hinge.



PATENTED DEC. 8, 1903. E. BOMMER. SPRING HINGE.

APPLIC A T I 0 N F I L E D F EB. 24. 1903.

N0 MODEL.

l l l I I I I l I I I I l I I I I l I V 1 \To. 746,272.

Patented December 8, 1903.

PATENT ()FFICE.

EMIL BOMMER, OF NEW YORK, N. Y.

SPRING-HINGE.

. SPECIFICATION forming part ofLetters Pam No. 746,272, dated December s, 1903,

Application filed February 24 1908. $aria1 No. 144,672. (No model.)

To all whom it may concern.-

Be it known that I, EMIL BoMMERga citizen of the United States, residing in New York, in the borough of Brooklyn and State of New York, have invented certain new and useful Improvements in Spring-Hinges, of which the following is a specification.

This invention relates to improvements in single and double acting spring-hinges, and more especially to improvements by which the ball-shaped terminals that are applied to the ends of the pintle are firmly locked in position on the pintle without requiring the extension of the pintle ends through the terminals and the upsetting of the ends over the same; and for this purpose theinvention consists of a spring-hinge the pintle of which is provided with screw-threaded ends, pintle tips or terminals provided with an interior screw-threaded socket-hole of diiferent pitch than the screw-thread at the ends of the pintle, so that on screwing home the pintle'tips or terminalsa rigid connection between the same and the pintle ends is obtained.

The invention consists, further,of a springhinge the pintle of which is provided with screw-threaded ends, pintle-tips having an interior screw-threaded socket, the thread of the socket being of different pitch than the thread of the pintle end, a raised point or points at the circumference of the pintle-tip base, said raised projections engaging cavities or depressions in the bent-up ears of the flange, so as to produce thereby the rigid interlocking of the pintle-tips'with the pintle ends, as will be more fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents an elevation of a single-acting spring-hinge, partly in section through the upper part of the same, and showing the con nection of the upper pintle-tips with the pintle; and Fig. 2 is a vertical central section of the connection of the upper pintle end with its pintle tip or terminal, ,drawn on a larger scale.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a a, are the flanges of my improved spring-hinge; b, the spring-barrel which is applied to one of the flanges a; d, the upper spring-holder; e, the

I ,upper pintle-socket; f, the pintle, and g the upper and lower pintle tips or terminals. The pintle-tips g are provided with interior screw-threaded sockets, which are drilled in the same and are provided with screw-threads of somewhat different pitch than the screwthreads at the ends of the pintle f-that is to say, the interior screw-thread of the pintletip socket has, for instance, twenty-fourconvolutions to the inch,while the screw-thread of the pintle end has twenty-three and one-third convolutions to the inch, or Vice versa. By

this difference in pitch between the interior screw-thread of the pintle-ti p and the exterior screw-thread of the pintle end the threads of the pintle-socket crowd upon the threads of the pintle end when the pintle-tips are screwed on the ends, so that the firm interlocking of the parts is obtained,-and thereby the gradual unscrewing of the pintle-tips 'from the pintle during. the use of the spring-hinge is prevented. The more the pintle-tip is screwed on the pintle end the tighter becomes the connection between the parts by the crowding up of the threads, so

that it is impossible without the use of a wrench to disconnect the parts. In order to obviate any disconnection of the parts, each pintle-tip is provided at its base with a small or disconnection of the pintle-tips from the pintle ends prevented.

The flanges with the bent-up ears being made of sheet metal, there is sufficient spring in the ears of the hinge to permit their being sprung down out of the way of the projections of the pintle-tips. screwing down of the pintle-tips, and when they are screwed down the desired amount the ears are permitted to spring back, where'- by the projections of the pintle-tips will be seated and anchored in the cavities of the bentup ears of the flange. By the twofold .connection of the pintle-tipson the one hand, by their interior screw-threaded sockets with the threaded pintle ends, and, on the other hand, by the connection of the projection or projections of the base of the pintle-tips with This permits the 7 the cavities or depressions in the bent-up ears of the flange a'an absolute and reliable connection between the pintle-tips and pintle ends is obtained, so that the same can never get loose from the pintle as long as the springhinge is used.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a spring-hinge, the combination,with the flange and pintle, the latter being provided with screw-threaded ends, of pintle tips or terminals provided with interiorlythreaded sockets, the pitch of the socketthread diifering slightly from the pitch of the screw-thread of the pintle end, substantially as set forth. 

